| Issue |
EPL
Volume 151, Number 1, July 2025
|
|
|---|---|---|
| Article Number | 16002 | |
| Number of page(s) | 6 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/ade73a | |
| Published online | 16 July 2025 | |
Influence of self-affine roughness on the nonlinear actuation of micromechanical device via the lateral Casimir force(a)
Department of Condensed Matter Physics, Faculty of Physics, Alzahra University - Tehran 1993891167, Iran
Received: 27 March 2025
Accepted: 23 June 2025
The effect of self-affine roughness on the actuation of a micromechanical system (MEMS) under the influence of the lateral Casimir force is investigated. For a conservative system, both bifurcation curve and phase portrait analysis show that when the surface of components is extremely rough, reducing the roughness leads to a wider stable operation area under small lateral displacements. Smoother rough surfaces exhibit the opposite behavior. Large lateral displacements reduce the stable area as roughness increases. In non-conservative systems, the Melnikov method reveals that a significant increase in roughness leads to a substantial reduction in the stable area, causing chaotic motion in MEMS with sever rough surfaces. On the other hand, reducing roughness on smooth surfaces can lead to chaotic motion.
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